1. A. Al-Muhanna, L. J. Mawst, D. Botez, et al., Appl. Phys. Lett. 73, 1182 (1998).
2. D. A. Livshits, A. Yu. Egorov, I. V. Kochnev, et al., Fiz. Tekh. Poluprovodn. (St. Petersburg) 35, 380 (2001) [Semiconductors 35, 365 (2001)].
3. X. He, S. Srinivasan, S. Wilson, et al., Electron. Lett. 34, 46 (1998).
4. N. C. Casey, Jr. and M. B. Panish, Heterostructure Lasers (Academic, New York, 1978; Mir, Moscow, 1981).
5. J. Temmyo and M. Sugo, Electron. Lett. 31, 642 (1995).